B - Operations – Transporting – 41 – J
Patent
B - Operations, Transporting
41
J
B41J 2/32 (2006.01) B41J 2/345 (2006.01) B41J 2/35 (2006.01) B41J 2/355 (2006.01)
Patent
CA 2264417
A thermal printer has a thermal head in which a Field Effect Transistor (FET) is connected in series to an individual heater element of each of a plurality of heater element groups which are connected in parallel with each other, and to which one capacitor for smoothing power and eliminating noise is connected in parallel relative to the heater element group. The thermal head performs printing on thermal paper. The thermal printer includes a printing power source circuit, a failure detection power source circuit, a failure detection circuit for detecting the presence and absence of a failure of the heater element by comparing a voltage generated at opposite ends of the detecting resistor with a threshold value. Field Effect Transistor control means is provided for causing discharging of the capacitor by simultaneously turning on all of the Field Effect Transistors under the condition where the printing power source circuit and the failure detection power supply circuit are turned off, before the voltage is supplied from the failure detection power source circuit to the thermal head and the failure detection is performed.
Corporation Nec
G. Ronald Bell & Associates
LandOfFree
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